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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1063
                            NSS vulnerabilities
                               28 April 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libnss3
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Access Privileged Data          -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Provide Misleading Information  -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-5461 CVE-2016-2183 

Reference:         ASB-2017.0042
                   ASB-2017.0028
                   ESB-2016.2239.2
                   ESB-2016.2238

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3270-1

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==========================================================================
Ubuntu Security Notice USN-3270-1
April 27, 2017

nss vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 17.04
- - Ubuntu 16.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in NSS.

Software Description:
- - nss: Network Security Service library

Details:

Karthik Bhargavan and Gaetan Leurent discovered that the DES and Triple DES
ciphers were vulnerable to birthday attacks. A remote attacker could
possibly use this flaw to obtain clear text data from long encrypted
sessions. This update causes NSS to limit use of the same symmetric key.
(CVE-2016-2183)

It was discovered that NSS incorrectly handled Base64 decoding. A remote
attacker could use this flaw to cause NSS to crash, resulting in a denial
of service, or possibly execute arbitrary code. (CVE-2017-5461)

This update refreshes the NSS package to version 3.28.4 which includes
the latest CA certificate bundle.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.04:
  libnss3                         2:3.28.4-0ubuntu0.17.04.1

Ubuntu 16.10:
  libnss3                         2:3.28.4-0ubuntu0.16.10.1

Ubuntu 16.04 LTS:
  libnss3                         2:3.28.4-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  libnss3                         2:3.28.4-0ubuntu0.14.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use NSS, such as Evolution and Chromium, to make all the necessary
changes.

References:
  http://www.ubuntu.com/usn/usn-3270-1
  CVE-2016-2183, CVE-2017-5461

Package Information:
  https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.17.04.1
  https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.10.1
  https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.1
  https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.14.04.1

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===========================================================================
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===========================================================================
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